I have a GE stackable dryer that is making a high pitched squealing noise. Is this something that I can fix on my own? How do I fix it?

It sounds like you need a bearing for the drum. Some driers have a bearing that supports the rear of the drum; apparently you have one that does. The only remedy is to remove the drum and repack the bearing with high-temp grease or replace the bearing if that is not possible. DrTom4444